Lubricant compressor



June 5, 1945. w; 2,377,577

LUBRICANT COMPRESSOR Filed. May 24, 1943 2 Sheets-Sheet l Patented June 5, 1945 Ernest W. Davis, River Forest,`Ill., assignor to Stewart-Warner Corporation, Chicago, ill., a

corporation of Virginia r Application May 24, 1943,` Serial No. 4ss,2o4 `icaims. (o. 222-318) My invention relates to lubricant compressors, and more particularly to hand operated lubricant compressors wherein it is desirable to release the pressure in the discharge conduit after each lubricating operation. A compressor of this type is disclosed in my United States Patent No. 2,172,- 136, of which the present invention is an improved constructlon. i

A compressor ofthis type is ordinarly provided with a, flexible, high pressure, lubricant hose, one end of which is connected to the dscharge outlet of the compressor.` The other end of the hose is ordinarily provided with a detachable coupling adapted for successive connectionwith numerous lubricant fittings attached to bearings requirng lubrication. The lubrication of i some bearings requires considerable pressure, so that the residual pressure remaining in the hose after the coupling is removed from a fitting, may tend to cause objectionable oozing and dripping of lubricant from the coupling during the operation of transferring the `coupling from one fitting` to another. i i\ The primary object of the present invention is to provide efiicient means for releasing this residual pressure before each removal of the coupling from a fitting to which it is attached, and thereby prevent the objectionable oozing and dripping previously described.

TA more specific object is to provide such a pressure release'in which the operation of releasing the pressure will not be overlooked by the operator of the compressor.

Another object is` to provide a lubricant compressor of the class described which is sturdy in i Construction, and which avoids the use of any intricate or delicatemechanism in its design.

Another object is to provide such a lubricant compressor which avoids the use of forgings in its construction, and which can be manufactured at low cost by means of high-production manufacturing methods.

A further object is to provide a lubricant compressor of the class' described which avoids the use of trickey assembling Operations and critical adjustments. These and other objects will appear as the description proceeds.

i In the drawings:

Figure 1 is a plan View of the improved lubricant compressor; i

Figure 2 is a partial sectional elevation of the same, the section being made on the line 2, 2, in

Figure 1; j Figura 3 is an enlarged longitudinal section of the pivot stud shown in Figure 2; and

Figure 4 is an enlarged elevation of the pivot pin shown in Figure 1 and Figurez.

The lubricant reservoir '6 is constructed of sheet metal and has an opening" 8 in the top,` through which the reservoir 6 may be replenished with lubricant. The cover o is held in' place by the wing nuts !2, !2. The tubular member I4 is bored out at the lower 'end to provide a cylinder IS in which the pisten IB may be moved with vertical reciprocating motion by means of the piston rod and hand lever 22. The foot valve 24 prevents reverse flow'of lubricant from the cylinder !6 to the reservoir 6, and the check' valve 26 prevents lubricant bypassing the pisten l8 during its upward movement in the cylindero IS. i j

The head 28 is Secured to the top of thereser- Voir 6 by meansof the nut 3D,and is threaded at its lower end for attachment of the tubular i stud 34, shown more clearly in Figure 3. The

member l4. The head 28 is provided with a tapped discharge `outlt` 32 for connecting an ordinary grease hose (not shown) having a cou pling at its free end for making Successiva, lubricant tight connections with a plurality of lubricant fittings attached to mechanism requiring' lubrication. I i

The head 28 is alsotapped to receive the pivot pivot stud 34 is screwed very forcibly into the head 28 and, if preferred, may be brazed in that position, after 'which it iscross drilledto receive the pivot pin 36, shown more clearly in Fgure 4. The pivot` pin 36 is provided with a groove 38, for registering with the steel ball 4|1` (Figure 3) which is urged towards the groove 38 by the spring 42, whichis retained by the plug`44. j

The head 28 is also tapped to receive the tube coupling 46, for making connection with the i metal'tube 48, which is connected with the release valve 58. The release valve includes a body member 52, having a valve seat 54 forming a lubricant tight seal with the ball closure 56. The bushing 58 is screwed into the body member 52, and is provided with a fiange portion 60, which compresses the bottom of the reservoir 6 against the body portion 52.

The foot lever 62 is pivoted on the shaft 64, and

. is provided with an upwardly extending footengaging portion 63 which protrudes upwardly through an opening 68 in the stabilizing pedal 10. When the operator operates the hand lever 22 he finds it necessary to apply his foot to the stabilizing pedal 18. This causes downward movement of the foot-engaging portion 86.

thereby causing tilting movement of the foot wardly against the valve seat 54.

i resrvoir for lever 62, which engages the thrust pin 12, and thereby causes the ball closure 55 to move up- When the operator has finished lubricating a hearing he removes his foot from the stabilizim; pedal 10 before removing the coupling from the fitting. llhi all qwsthe ball clour 56, to move away fromgth al the lubriantpressure in the release valve 50, so that the lubricant may flow past the ball clo- .sure 56, and out through the vent openings M,

"M, and into the reservoir B.

In replenishing the reseryoir with lubric nt, the pivot pin 36 is withdrawn from the pivot stud 34; the hand lever 22 is swung in a counterclockwise direction as far as it will go; the wing nuts !2, and cover lo are removed&-and-therserVoir 6 is then filled with lubricant through the opening 8. v

Without further elaboration; the foregoing will so fully explain my invention; that .others. may, by` applyingiknowledge :current-;at theitime of application, .readilytadaptv the same for use under various conditions of service.

Iolaim: 'In: .a lubricant compressor, the combination of &lubricant pumpingmechanism a discharge outletforv- Said pumping mechan'sm; -a handle movable in. asubstantially vertical plane for op erating' saidapumping ;mechanism i alubricant reservoir for supplyng lubricant., to said pumping mechanism .aastabilizfng. pedal connected .with saidrservoirand x'ositioned at :the base thereof ingsubstarrtial verticaalignment with said han'- dle, whereby the application of pressure from an operatorfs.` footappliecl. to said stabilizing pedal whilesaidhandles.. b eing-operate'- will enhance thaStabItY. ofsaid lubricant compressorga lut\ to' said stabilizihg p'edal;m

`2. In a lubricant compressor, the combination of raubr ioant pumpingmecha'nism a discharge outletuiforl-'said .pumpingt. meohanism a handle movable' in a substantially Vertical plane' for o-peratings'aid pump'ing mechanism; a lubricant spplying lubricant to 'said pumping l vel' a e a@ 4 erating said pumpln g;

I saidpassageway-;.='

with sad reservoir -and positioned in substantial" -mechanism; a stabilizing pedal connected with said reservoir and positioned at the base thereof in substantial vertical alignment with said handle, whereby the application of pressure from an operator's foot applied to said .stabilizing pedal While saidhandle is being operated, will enhance thestability ,ofsa id lubricantnompressor; a. lub icant a sa way onn tin la s idr .pumping mechanism with said discharge outlet; a release .valve for releasing'pressure in said passageway; a level pivotally supported by said stabilizing .pedaLc said :lever being provided with a foot-enag an r on extendin above said stabilizing nedalgand nactuated by movement of said operation of said pump will then producepressure in saidlubricant passageway.

3 n a lubrica'nt compressor, the combination of a lubricant pumping mechanism; a discharge 01113181327 for saidr'pumping' mech'ani'sm -:a handle y movable ima substantiallyvertical plane -for op-'` erating- --said pumping i mechan-ism a lubricant v reservoir :for supplying lubrioant-to said pumping meohanism alubrieant =passagevc'aly` conneeting` said pumpi-ng mechanismwith said disoharge out: let; .a release .valve forreleasing'pressure in said passageway; a stabilizing pedal:connected with` said. reservoir and: positioned at the basethreof in substantial vertical alignment with said-:han dle, v e said stabilizing -pedal- :having an opening therei-n;- a foot-engagingvportion extending upwardly I through said open-ing ;rand means operatedby downward movement of-said fot engag- V ing portionfor :closing:said-: release valve In -a lubricant compress'or, the com'biri'ation ofa: lubricant pumping mechanism'a clischajrge outletxzf or said pumpin-g amechanisma handle movable in a substantiallyvertical plane rof op' mechanis'm;

lubricant reservoir :for: supplyingv ;lubricant :to said pumping meohanism a lubrioant passageway connect: ing said pumping meohanism with said discharge o-u'tl'et a release valve fo'r releasing 'pressure in a stabilizing pdal connected vertical alignment with s-aid han-dle; said stabilizing' pedal: being located near the'base of='sad tes ervo ir for convenient applicationaofiamoperator's 'foot onsaid stabilizing -peda'h a movable 'member positioned for the convenient-'application er antoperator's root thereon simultaneouslye with the application of `saidjoperator's `foot'on sai-d stabilizing pedal and 'means actuated by'movementof said release valve. l c

u ERNEST W. DAVIS.

ng said release valve, whereby the movable member for closing said 

